Every 100 years is called a century, made up of 10 decades.
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bidecadal
True.
A false rumor is floating around the Internet that this happens only once every 823 years. The reality is that it happens whenever the first day of October is on Friday, which happens on average once every seven years. The last time for this "rare" event was 6 years ago, back in 2004. And the time before that was 5 years previously, in 1999.
Every 200 years
Oh, dude, something that happens every 4 years? That's easy, man. The Olympics! It's like a massive global sports party that comes around every four years, where athletes from all over the world compete for gold medals and national pride. So yeah, mark your calendars, because the Olympics are like the ultimate every-four-years event.